The term gastrointestinal (GI) refers collectively to the organs of the body that play a part in food digestion. A gastroenterologist is an internal medicine physician who has undergone additional education and training to specialize in gastroenterology, or the treatment of diseases in the gastrointestinal tract and liver.

Liver disease, also called hepatic disease, refers to a number of diseases that may affect the liver and its function. The liver plays a role in the production of bile, blood-clotting factors and amino acids, and aids in the processing and storage of iron for red blood cell production.

Most people have experienced some type of stomach problem or discomfort in their lifetime. A person experiencing swallowing problems, which is called dysphagia, may have difficulty swallowing foods or liquids.

Ulcerative colitis (UC) is an inflammatory bowel disease (IBD) that causes inflammation in the lining of the rectum and colon. Ulcers form where inflammation has injured the cells that usually line the colon, which then may bleed and create pus.